.nav {
  width: 100%;
  height: 42px;
  background-color: #fff;
  padding: 0 16px;
  line-height: 42px;
  display: flex;
  justify-content: space-between;
}

.title {
  width: 150px;
  height: 42px;
  font-size: 22px;
  text-align: center;
  position: relative;
}

.title::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border: 12px solid;
  border-color: #fff transparent transparent;
}